Screen for the rollers of printing-presses.



W. KNOERR.

SCREEN FOR THE ROLLERS 0F PRINTING PRESSES.

APPLICATION FILED Amzs. Isla,

Patented Oct. 29, 1918.

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WILLIAM KNOERR, OF PHILADELPHIA, PENNSYLVANIA.

SCREEN FOR THE ROLLERS 0F PRINTING-PRESSES.

Specification of Letters Patent.

Patented Got. 29, 1918.

Application filed April 25, 1918. Serial No. 230,758.

To all whom it may concern:

Be it known that I, wWILLIAM KNonnn, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania., have invented a new and use ful Screen for the Rollers of Printing- Presses, of which the following is a specification.

My invention consists in providing the rollers of a -printing press with a screen shield or covering thereover, the same preventing foreign material such as dust, dirt, cuttings of paper, etc., from reaching said rollers and injuring the surface thereof, as well as the form to which ink or color is applied, thus producing superior results in printing, said screen or covering being adapted also to permit the inking rollers to be seen therethrough.

The invention is satisfactorily illustrated in the accompanying drawing, but the important instrumentalities thereof may be varied, and so it is to be understood that the invention is not limited to the specific details shown and described, as long as they are within the spirit or scope of the claims.

Figure 1 represents a vertical section of a portion of a job printing press, and of the screen or covering embodying my invention applied thereto.

Fig. 2 represents a perspective view of the screen removed from the press.

Fig. 3 represents a front elevation of the screen.

Fig. 4 represents a vertical section of the invention as applied to a cylinder press.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings.

1 designates part of the frame of a printing press,that of a job press. 2 designates a bed for the form 3. 4 designates the reciprocating impression platen which carries the sheet to be printed. 5 designates a reciprocating carriage on whose side bars 6 are mounted the inking rollers 7 which apply the ink or color to the form 3. 8 designates rollers which distribute ink or color supplied from the fountain 9 to said rollers 7 These features are old and well known in the art.

1 0 designates a sheet of celluloid or other transparent and iieXible material of similar nature whose edge portions are connected with the frame 13 which latter is formed of metal or other material of a rm nature in which are openings through which are passed the securing screws 14 which latter are driven into said bars 6 thus sustaining the screen on the carriage. Between said side bars 6 and said frame 13 are the spacing blocks 12 which serve to set out the frame from said bars and with it the sheet 10 thus preventing contact of the rollers with said sheet or vice versa, the entire sheet being clear or unobstructed throughout so that the rollers are entirely visible from in front and their inked condition may be observed, while the sheet forms a screen which prevents dust, dirt, fragments of paper or other foreign substances from lodging on the rollers which otherwise would mar the surface of the latter and render them irregular and injure the working of printing.

The upper portions of the sheet and of the surrounding frame are continued above the top roller and deflected rearwardly over the latter forming in a measure the canopy 15 which overhangs the top of the carriage and consequently the rollers in a rearward direction, thus screening the rollers from above.

The frame 13 is shaped to accord with that of the carriage 5 and when the screen is fitted thereto and has its edge portions connected therewith and openings are formed in the frame and carriage to receive the screws 14, the screen may be applied to an existing press.

The sheet and its frame are of light nature, so that they do not materially add weight to the carriage vand the sheet being somewhat flexible is not liable to be broken by ordinary contact of the printers hands thereagainst. The canopy 15 prevents such substances from dropping upon the rollers at the top of the carriage 5, or into the latter, the surfaces of the rollers thus being preserved in normally clean condition, the eect of which upon the form is apparent.

In Fig. 4 I show portions of an embodimentof my invention as applied to a cylinder press, where 16 designates the form bed, 17 the inking rollers, 18 the impression roll, and 19 the inking bed, all as well known.

Connected with the fra-me which forms the bearings of the rollers 17 and arching over the same is the sheet 21 which is secured to said frame and accomplishes the same purpose as the sheet or screen 10 in the other figures, but as is evident the invention is serviceable for screening the inking rollers of all forms of printing presses employing such rollers for the purpose stated.

I- laving thus described my invention what I claim as new and desire to secure by Letters Patent is l. A screen for the form roller of a printing press adapted to cover the surface of said roller to prevent lodgment of foreign substances thereon and to permit said suriace to be visible through the screen, consisting of a sheet of transparent material, a support for said sheet, and means for connecting said support with the bearing member of said roller, said sheet being adapted to be placed in front of the surface of said roller, and rearwardly over the top of the same.

Copies frame by which said sheet is supported, and

means for attaching said frame to the bearing member of said roller, said frame being adapted to sustain said sheet in front of the surface of said roller and to, extend upwardly and rearwardly over the top of the latter.

WILLIAM KN OER-R.

Vitnesses:

ROBERT S. HAMILTON, WINFIELD H. SMITH.

of this patent muy be obtained for., ve cents each, by addressing the iCommissioner of Paten-ta Washington, D. C. 

